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What you need to know about Steve Bannon

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What you need to know about Steve Bannon01:27

Washington (CNN)Former White House chief strategist Steve Bannon has privately confided that he believes President Donald Trump only has a 30% chance of completing his full term, a source told Vanity Fair.

According to two of Vanity Fair's sources with knowledge of the conversation, Bannon warned Trump several months ago that the biggest threat to his presidency is not impeachment by Congress, but the 25th Amendment -- which could allow his Cabinet to vote to remove him.

CNN has been unable to independently confirm these reported conversations. Bannon could not be reached for comment.

The 25th Amendment to the Constitution is a measure that establishes a system for replacing the president or vice president in case there is a death, removal, resignation or incapacitation.

Also, if the vice president "and a majority of either the principal officers of the executive departments or of such other body as Congress may by law provide" make a "written declaration that the president is unable to discharge the powers and duties of his office, the vice president shall immediately assume the powers and duties of the office as acting president."

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The 25th Amendment was adopted following the assassination of President John F. Kennedy in 1963.

According to the two sources who spoke to Vanity Fair, when Bannon raised the 25th Amendment as a concern, Trump responded by asking, "What's that?"

The report comes amid a public feud between Trump and Sen. Bob Corker, R-Tennessee, who is retiring from Congress after 2018. The two have gone back and forth via Twitter, and Corker told The New York Times that he thinks Trump could take the US "on the path to World War III."